reductone

any reducing substance with a chemical structure containing the stabilized enediol −C(OH)=C(OH)−. Reductones are generated when monosaccharides are heated for prolonged periods with strong alkali, whereby the enols originally produced are broken down to strongly reducing fragments. Another notable example is ascorbic acid, and in some contexts reductones are described as 'apparent ascorbate', i.e. the reductive acids that are present in certain processed foods and react similarly to ascorbate, interfering with its determination.

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